Question

If the mean of $10,12,18,13,x,17$ is $15$, find ${}^{\prime }{x}^{\prime }$.

Answer 1

Given Mean of $10,12,18,13,x,17$ is $15$

$⟹\frac{10+12+18+13+x+17}{6}=15$

$⟹70+x=90$

$⟹x=20$